Calculating machine



March 1, 1960 E. A. DAVIS ETA!- 2,926,845

7 CALCULATING MACHINE Filed Dec. '25, 1955 11 Sheets-Sheet 1 March 1, 1960 E. A. DAV'IS Em. 2,926,845

CALCULATING MACHINE 11 Sheets-Sheet 2 Filed Dec. 23, 1955 Marchl, 1960v E. A. DAVIS ETAL CALCULATING MACHINE 11 sheets-sheet 3 Filed Dec. 23, 1955 March 1, 1960 E. A. DAVIS ETAL CALCULATING MACHINE l1 Sheets-Sheet 4 Filed Dec. 23, 1955 Malch 1, 1960 DAVls ETAL CALCULATING MACHINE ll Sheets -Sheet 5 Filed Dec. 25, 1955 March 1, 1960 I A. DAVIS T L 2,926,845

CALCULATING MACHINE Filed Dec. 25, 1955 11 Sheets-Sheet 6 March 1, 1960 E. A. DAVIS ETAL CALCULATING MACHINE ll Sheets-Sheet 7 Filed Dec. 25, 1955 CALCULATING MACHINE 11 Sheets-Sheet 8 Filed Dec.

March 1, 1960 E. A. DAVIS ETAL CALCULATING MACHINE ll Sheets-Sheet 9 Filed Dec. 25, 1955 March 1, 1960 E. A. DAVIS ETAL I 2,925,845

CALCULATING MACHINE Filed Dec. 23, 1955 11 Sheets-Sheet l0 March 1, 1960 E. A. DAVIS EI'AL CALCULATING MACHINE 11 sheets-sheet 11 Filed Dec. 23, 1955 Uited, States PatentO 2,926,845 CALCULATING MACHINE snag-rs. Davis, Cast'ro' Valley, and Nathaniel F. Hawthorne, Alameda, ,Calilfl, corporation of California l p cation December 2s,19ss,ssria1.No.-ss4,e1s; '10

1; Claims. e1; 2 35 This invention relates to calculating machines and is 1 concerned more particularly with providing an improved automatic carriage shifting control means therefor.

. Another object of the invention is to provide'a calculating machine with an improved mechanism for conditioning the machine as a preliminary step to an automatic division operation.

Another object of the invention is to provide an improved mechanism fora calculating machine by which a value may be. automatically entered in the register of the machine in any preselected ordinal position of the Fig. 1 is a sectional elevationalview taken on a plane extending longitudinally of the machine.

Fig. 2 is an elevational view of the plus-minus gate control, the view being. taken on the planes indicated by the lines 2'-2 of Fig. 4. 1 1

Fig. 3 is a view showing a portionof the mechanism on the inside of the right side frame of the 'tnachine, with a portion thereof broken away to show the main drive clutch.

2. r Fig. 14' is arear" elevational' view of "the tabulatorkeys and the mechanism controlled thereby; the view being taken on the planes indicated by thelines I l--14 of Fig. 9.

Fig. 15 is a. front elevationalview of the tabulator key controlledamechanism shown =in-"Figa 1'4 and taken on the; planes indicated-by the lines 1-5-15 of' Fig. 9;

Fig. 16 isajplan' view of -the tabulator key controlled mechanism shown in Figs; 14v and" 15 ,and taken on a horizontal plane'below-the front-carriage rail..

Fig. 17 is an enlargedsectionahdetail of -the tabulator key controltakenon:a.planeindioated by the line 1717 of Fig. 14;

Fig. 18 is an enlarged fragmentaryright' side elevational view of the: dividend tabulating, control mocha-- ni mm I Fig. 19 is a front-sectional view of the mechanism illustrated in Fig". 18, the view being. taken on the plane indicated by the line 19-19 of Fig. 18.

Fig; 20 is a view of the. release mechanism for the dividend tabulating key latch.

The inventionis-disclosed as embodied in a Thomastype calculating machineyin which the actuating mechanisrn is olithev unidirectional, continuous drive, cyclically )operated type, and allpower-dr-iven operations are elfectfed by engagement and-disengagementof' asingle clutch providing. the'only path of power. flow from the motor of themachine to the motor driven parts thereof. Basically, a calculating machinexof. this construction is disclosed in the patentTtoCar-LM. F. Friden. No. 2,229,889 issued- January 28,1941" while certain of the powerdriven mechanismsr referredto herein may be found to be more fully disclosed. in the-patents of Nils H. Bergfelt, No. 2,893,631. issued Iuly" 7-, 1959-, Nathaniel. F.

I Fig-4 is a plan view showing the mechanism below the keyboard with the keyboard removed.

Fig. 5 is a fragmentary elevational view of the rear of the machineshowingthe shift control mechanism. A

Fig. 6 is anelevational view showing the right shift control, the view being taken on the plane indicated by the line 6-6 of Fig. 4. Fig. 7 is an elevational view showing the left shift :control, the view being taken on the plane indicated by the line 7-7 of Fig. 4.

Fig. 8 is an elevational view of the zero resettingcon rol, the view being taken on the plane indicated bythe line 8 -8 of Fig. 4.

Fig. 9 is a fragmentary elevational view taken immediately inside the right-side frame which is indicated in phantom line, the view being taken on the plane indicated by the line 9+9 Of'Fig. 4.".

Fig. l0 is a fragmentaryseetional elevationalview taken transversely of the machine to illustratea portion of the zero resetting mechanism. v Y --;Fig. l1 isa plan view of thezero resetting clutchtaken on the-planes indicated by the lines 11-11ofFig. v10.

ig. 12'. is .a view of a portion of the zero resetting latshl en ag s Fig. 1 3 is an enlarged elevational view of the; power control mechanism for the right and left shift. clutches, the view being taken on a plane coinciding with line 7--7 of 'Fign4; "but showing particularly the power-operated mechanism not shown in Fig. 7.

Hawthorne, No. 2,852,192 issued September '1-6," 1958,

and" Nathaniel F. Hawthorne et aL, No. 2,847,160 issued August 12, 1958. a

As" illustrated, the machine is provided with a duplex register, but since the invention is concerned more particularly with the register carriage. only a brief descript-ionrof the duplex mechanism will be given. The. machine includes a'base-{not shown-)1, upon which right side frame 10,..left side; frame- 11, auxiliary frame 12,

,and;,. eontrol1firames 13 and T4 are mounted (Fig. 4). -The, frame. construction oflthe machine also includes transverse brackets .16," 17,18, 19", 20. 21 and 22. (Figs.-

1-, Sand 9) whiclzrextend betweenright and left side frames 10- andll, respectively, and are secured thereto in any conven fintmanner; The machine includes a shifta'bleregister carriage, in-

dicated generally at 25 (Fig. 1):--which, is supported for endwise sliding movement by transverse bracket 22,-intermediate its width by transverse bar 27 secured on bracket 19, and at the rear by means of shaft 28 (Fig. 5') secured at its ends to each of similar carriage end frames 29. Shaft 28 is supported for sliding movement in a bushing mounted in side frame 10 and ina bushing mounted in the vertical portion 32 of a bracket 33, which is securedvto transverse frame member 21 by any suitable means, such as screws 34. Formed at right angles to the vertical portion 32, horizontal portion 35 of'bracket 33. is secured to bracket 36 mounted on side frame member 11 to accurately maintain coaxial alignment of the bushings and shaft 28 slidable therein.

The duplex register carriage 25 serves to mount numeral Wheels 37 of the revolutions counter. Numeral wheels 37 (Figs. 1 and 9) are actuatedby means of-a conventional actuator, indicated-generally at 38, mounted on shaft 39 -which is rocked; clockwise from maindrive shaft 69 through 'a -,springconnection into operative .en

gagement Withjthe aligned numeral wheel 37 and is then translated axially to effect entry of the digit. When no .wli atented it Mar: 7 1:,:

count is to be made, the clockwise may be restrained in a. well-known manner by means of a neutralizing finger (not shown), the movement of which is controlled by the plus-minus gate 58. In the neutral position of gate 58 theneutralizing finger underlies arm of the counter actuator and thereby blocks rocking movement thereof. Carriage 25 also mounts numeral wheels 42 of one accumulator register, which are suitably journalled in carriage frame 43, and'numer al wheels 44 of the second accumulator register; which are suitably journalled in carriage frame 45. --Numeral'wl1eels 42 are adapted for actuation'through suitable 'plus minus gearing 46 having a sliding driving engagement with square shafts 47. Likewise, numeral wheels 44 are adapted for 'actuation through similar plus-minus gearing 48 having a sliding driving engagement with square shafts 4'9. Each square shaft 49 is driven in cyclic relation to the ordinally aligned square shaft 47 through gearing 51 and the square shaft extension 50 of shaft 47. "-Eachshaft 47 receives difl'erential increments of movement in a wellknown manner from the associated actuating cylinders 52 under control of the usual banks of numeral keys 53 associated therewith.

The sign character of the registration in the first accumulator register is controlled by the shifting of the plus-minus gearing 46 under the control'of gate, or transverse bail, 58, which is mounted at either end by similar upright arms 59 secured on transverse rockable shaft 60. The sign character of the registration in the second accumulator register may becontrolled simultaneously with, or independent of, the first register by similar shifting of the plus-minus gearing 48 under the control of gate 61, mounted at its ends by similar upright arms 62 secured on transverse rockable shaft 63 (Fig. 2). Shaft 60 is suitably journalled at its ends in side frame members and 11, while shaft 63 is iournalled at its ends in side frame member 11 and auxiliary frame member 64 and intermediate its ends in side frame member 10. Each of the sign character control mechanisms may be controlled in any convenient manner for the performance of calculating operations.

A drive for the actuating cylinders 52 and for all other power-driven operations of the machine is derived from a motor (not shown) having its drive-shaft 65 (Fig. 3) connected by suitable gearing, including gears 66, to clutch gear 67, to which is secured a ratchet constituting the driving element of the cyclically operable clutch, indicatedgenerally at 68. Driving gear 67 and the ratchet integral therewith is journalled on driven shaft 69, which is suitably connected by bevel gearing 70 (Figs. 1 and 4) to actuator shafts 71. The cyclic operation of the clutch 68 is controlled in a conventional manner by means of clutch pawl 72 carried by driven member 73- secured on driven shaft 69, pawl 72 normally being urged by spring 74 into clutch-engaging position with respect to the ratchet on driving gear 67.

Engagement of the clutch is controlled by means of .clutch control lever 75 pivotally mounted at 76 on side frame member 10. Control lever 75 is connected by link 77 with the upper end of lever 78 pivotally mounted at 79 on side frame member 10, which lever '78-is pivotally connected at its lower end with link 80 by means of a pin extending through an aperture in sideframe member 10, the link being effective to control the opening and closing of the motor switch in a conventional manner. Control lever 75 is normally urged to the clutch disengaging position shown by spring 81.-

Plus-mz'nus -mechanism A similar pair of plus and minus keys 84, 85, re-

spectively (Fig. 2), serve to selectively control the posi tioning of plus-minus gearing 46 and 48 to determine the sign character of registrations ineither or both accumulator registers. Inasmuch as the present invention is concerned only with the numeral wheel dialsll Of the rocking movement lower register, that mechanism controlled by the plus and minus keys 84, 85- associated therewith will be described herein. The rearward and forward shifting movement of the plus-minus spools 46 (Fig. 2) is controlled by power upon engagement of unicyclic clutch 68 (Fig. 3) in accordance with the key 84 or 85, whichever one has been depressed. Keys 84 and 85 are mounted for endwise sliding movement on control plate 13 by means of respective mounting screws 86 and 87 and are normally urged to their raised position by respective springs 88 and 89. Key 84 carries pin 90 overlying the free end I of arm 91 pivotally mounted at 92 on link 93 having a pivotal connection at its rearward end with arm 97 secured on gate control shaft'60 and mounted at its forward end for endwise movement on control plate 13 by pin-and-slot connection 98. Similarly, key 85 carries pin 94 overlying the free end of arm 95, also pivoted at 92 on link 93. Arms 91 and 95 are normally urged in opposite directions about pivot 92-by "spring 96 to maintain arms 91 and 95 in engagement with respective gated slot in the end portion of horizontal arm 106 of bellcrank 107 pivoted at 108 on control plate 13. (The depending arm 109 of bellcrank 107 carries pin 110 intermediate its length for cooperation with the arcual end portionof arm when the arm 951s rocked clockwise by pin 94 upon depression of minus key 85. When arm 91 or arm 95 is operatively positioned relative to the respective pins m 110, the correlated rocking movement of the bellcranks 102 and 107 causes link 93 to be moved rearwardly or forwardly of the machine to control the adjustment of the plus-minus spools 46. 7 Adjacent the end thereof,- arm 109 carries roller 112, which cooperateswith cam 113 secured on drive 'shaft'69 to control the clockwise and counter-clockwise rocking movement of respective bellcranks 107 and 102. Each of bellcranks 102 and 107 is normally urged byspring 114 to the inoperative position'shown, which spring nor- 'mally serves also to maintain roller 112 in engagement with the cam 113. I

A depression of plus'key 84 or minus key 85' serves through conventional means'tdengage clutch 68 and to close the motor switch. Such meansar'e not considered pertinent to the instant invention and therefore are not shown. Substantially simultaneously "with the depression of plus key '84 and the positioning of the arm 91 for engagement by pin 100 on bellcrank 102, the engagement of clutch 68 is effective to drive cam 113 in a clockwise direction to immediately impart a clockwise rotation to bellcrank 107 and counter-clockwise rotation Ito bellcrank 102, thereby moving link 93 rearwai-dly .to 'shift plus-minus spools 46 to theadditive sign character control position. Similarly, the depression of minus key 85 serves through pin 94 to rock arm 95 clockwise into position for engagement by pin on arm 109 so that,

'upon engagement of the clutch and closing of the motor switch, the rotation of cam 113 immediately rocks bellcrank 107 clockwise, thereby moving link 93 for'wa-rdly of the machine 'to'shift the plus-minus spools 46 to-the left from the normally centralized position (Fig; 1)- to effect a subtractive registration on numeral wheeldials 42. Upon engagement of the, clutch 68, 113 is effective in the first 90 of themachine cycle to' maintain bellcranks 102 and 107m their'rocked position until a notch the free end of an arm of lever 116, urged clockwise by spring 118 about the pivot 117 on side frame 13, engages 'with ear 115formed at right angles to the lower end of armf1 09. A release of the described.

ti'oned' m smallersues that, upon de'press'i'd at ever 116" a area-ta By tti seawater ,Meia' a n b i il ptje've'nn'ns the pressionof either of keys, 84 or 85 uponpd p ssioii of I the other of the keys. For this purpose a, Yrshaped 122 is pivotally supported at 123 oh cont 1" 2 and the arms 124, 12s tner er carriage shift hiehtinisr'ri The carriage can be shifted selectively in eitherdirection by power-dtiven means under the control of manulily ,bp eribl keys, this mechanism being of conventional construction hifting of the accumulator carriage tame right or to the left is controlled by the direction of rotation of worm shaft 130 (Fig; 5) suitably journalled atits one end in the vertically disposed arm 32 ofv bracket 33 and adjacent its other end in side frames Ill and Carriage 25 carries a right-angle bracket 131'secured on carriage framev by any suitable means,- such as screws 132. TheQhorizontal portion of bracket 131 carries pin 133 depending therefrom for engagement with the thread in shaft 130, the helical angle of the threads of the worm shaft being such that for each: rotation of the shaft the carriage is moved to the right or left one-half of an ordinal step. Thus, to move carriage25 one ordinal step, two complete cycles of rotation of shaft are required. I

Two unicyclically operable clutches are provided to control the direction of rotation of warm shaft 130 in accordance'withthe depression of a selected control key.

' Referring to Fig. 5, the right shift contro l clutch is indicated generally at 136, While a similar clutch for con trollinga shifting operation of the carriage to the left is indicated generally at 137. I The driving element of each of the clutches I36 and 137 issecure'd on transverse shaft 138 journalled in side frame members 10 and 64 and in bearing 139 secured onnansverse frame member 2 0. Shaft138 is cyclically 'driven through bevel gear connection 140 with an extended actuator shaft 71, To effect. a right shift of the carriage 25 the driving element of clutch 136 is moved into engagement with a. single tooth dog'in tegral with ,32-toothed gear 141 rotatably mounted on shaft 138, whereby cyclic rotation of gear 141 serves, through a train of l6-toothed gears, to impart counterclockwise bi-cyclic rotation to shaft 130, as viewed from theleft'in Fig 5. Similarly, a left-shift of the carriageiseffected by engagement of the driving element of clutch 137 with the single tooth dog integral with the Iii-toothed gear 142 rotatably mounted on shaft 138.

Eachcyclierotation of the 32-toothed gear 142, through the 3 2-toothed idler gear 143 and the 16-toothed gear 144 secured on shaft 130, servesto impart a two-cycle clockwise r'o'tation to shaft 130. Worm shaft 130 ispositively centralized in each ordinallyshifted position of the accumulator carriage 25 to effect accurate alignment of the register dials and 44 with the'ordinal rows of keys 'in the keyboard of the machine. To centralize 1 shaft 13f0, two diametrically opposed shoulders in the periphery of the diskf147 secured on shaft 130 are engaged bythe extreme ends of arms 145 and 146 pivotally mounted on shaft 14 8 supported by side frames 10 and 64, which arms 145 and 146 are operated in scissorlike fashion upon engagement of either clutch 136 or 137 to release shaft 130 for bi-cyclic rotation.

, Ether of clutches 136 or 137 may beselectivelyenj gaged'hy depression of the respective shift control keys 7 can Fg. an sprii g 168;. Am 1 9' isjsecuredj to one 'e'iid (if a sleeve 170 (Figs. 4 mid 6), th e' Other end of which carriesfa depending arm, 171 having a pin 172 adjacent the lower end thereof for a purpose hereinafter described. Arin169 and 171 are rockable as a unit n shaft 1601. p

. Arm 158 1(Fig 3), rockabl'e in a clockwise direction by roller 156 onleft shift contr'ol key 153,; is secured on shaft lfio Int'ermediate its ends shaft 160 carries depending'iarr'n 173 (F s14 and 7) onwhich pusher arm 6 174 ispivotally c nfaeeted a: 17s for control by the rocking of shaft 160. S p-ring 176 normally urges the notched end of pusher aiirfl'lti into engagement with at 1 111177 interposed between thenotch ofarrn. 174 and thee'nd of, left shift push radii-[sand carried byan arm I t 1 80". spring- 179' normally serves to urge pushrod 178 to the linoperative position shown. Arm 180 is cooper ativ ely connectedto adepen'ding arm 181 by a' sleeve 18 2 rockably mounted on shaft 160. A pin' 18 3 on arm 181' serves, in cooperation with arm 180' and pin 177, to automaticallycontrol a left carriage shifting" operation, as will be described hereinafter. I

Referring to Figs. 3, 4, 6 and 7, the depression of right shift control key 152 rocks arm 157 and therefore 211111162 clockwise and countenclockwis'e, respectively, as viewed in- Figs; 3 and 6, and through pusher arm 1'64, mdvesright shift push r'od167 rearwardly to engage right shift clutch 136*,"While' a depression of left shift key 153 rocks arm 158 and therefore shaft 160 clockwise inFig. 3, to rock aim 173 counter-clockwise, as viewed in Fig. 7 wlie"reupon' pusher arm 174- moves left shift push rod 178 rearwardly of the machine to effect engagement .of left shift clutch 137. Each of push rods 167 and 178 or endwise sliding movement in transverse frame members 16 and 18, and are provided at their rearward ends with respective depending members 188 and 189 (Fig. 5) which ser ve to control the engagement of shift clutcliesiflfi'and 137'. Each of dependingimemhers 188 and 1'8'9 isprovid'ed with an ear formed at right angles lower end thereof, which serves to provide a pivotal connection for one end of respective connecting links 190 arid "1 9 1; The other end of connecting link 190 is pivmallyeennected to the upper end of arm 192 secured to one end of sleeve 193] rockably mounted on shaft 194;, h At itsother end sleeve 193 carries-arm 195 which serves, upon the rearward movement of push rod 167, to efiect engagement of right shift clutch 136. Sitn ilarly, the rearward end of link 191'has a pivotal connection with arm 196 pinned to shaft 194 which, at its left end (Fig. 5), carries arm 1 97 pinned thereto to control the engagementfof-leftshift clutch 137 upon'the rearward-movement ofpushi'od 178 and the rocking of shaft mp4; The engagement at the clutches 136 and fockifig df 1'95 and 197 is effected in on'a] m nfierflss disclosed in the afore mentinned. Patent ,N .Q2,ss2,19j2.

provided for controltby the carriageZ S t upon reaching its rightmost or leftmost end position, to

Fig. 5) which is provided at its right end with elongated slot 204 engaged by pin 205 on depending bracket 206 secured to transverse frame member 29: v[.Lever 201 is normally urged (in'a clockwise direction iniFig. 5) by spring 207 to maintain, the right end of slot 204 adjacent pin 205. The slotted end of the link 203 is. distended l ally connected to the left end of link 203 (right end in to provide a cam surface operably related to roller 208 on an ear formed at a right angle to one arm 2090f bellcrank 210 (Figs. 19) mounted 'for' rocking movement on shaft 211 supported'in side frame 'members 10, 11 and 64. Arm 209 of bellcrank 210 also carries pin 212 normally maintained out of engagement with the free end of arm 213 secured on shaft 214 journalled in sideframe members 10, 11 and 64. 'Shaft 214 also carries arm 215 pinned thereto which, upon rocking of shaft 214, controls disengagement of the'right shift clutch 136 in the full-cycle position thereof. Upon engagement of clutch 136 by the rocking of arm 19 5, arm 215 and therefore shaft 214 is rocked clockwise (Fig. 9) to rock arm 213 into abutting relation with pin 212. A second arm.220 of bellcrank 210 carries pin 221 in engagement with arm 222 of bellcrank 223 pivotally mounted on depending bracket 224 secured on the transverse frame member "19 of the machine. Pin 225' on bellcrank 223 is engaged in the bifurcationin'the end of one arm 226 of bail 227 (Figs; 5 and 9) mounted for rocking movement-on shaft 60. The other arm 228 of the bail 227 extends forwardly of the machine and carries pin 229 engagingin an elongated slot in the rear ward end of lever 230 pivoted at 231 on bracke't 232 secured on transverse. frame member '16.. The forward end of the lever 230 is provided with an ear 233 (Figs. 6 and 9) formed at right angles thereto and positioned to underlie the rearwardly extending finger 234 of pusher arm 164.

As seen in Fig. 5, as the carriage 25 is shifted one ordinal position to the left from the position shown (to the right if viewed from the front of the machine), lever 201 is rocked counter-clockwise to move link 203 to the right, whereupon the cam surface on link 203 .becomes effective to rock bellcrank 210 (clockwise in Fig. 9) against the urgency of spring 235. Rocking of the bellcrank 210, through pin 212, imparts a counter-clock wise rotation to arm 213, shaft 214, and arm 215 to disengage right shift clutch 136 in the full-cycle position thereof. Simultaneously with the counter-clockwise rocking movement of shaft 214, pin 221 on bellcrank 210 serves to impart a clockwise rotation to bellcrank 223 which, through pin 225, rocks bail 227 and lever 230 to;

remove pusher arm 164 (Fig. 6) from its operative position with respect to push rod 167, thereby enabling spring 168 to restore pusher rod 167 to the inoperative position shown. I V l I The movement of the carriage 25 to its leftmost end position (as viewed from the front of the machine) operates in a similar manner to automatically disengage the left shift clutch 137, thereby terminating the shifting operation in the full-cycle position of the clutch. As the carriage 25 is moved to the left to the penultimate ordinal position thereof, a bracket (not shown), secured to the lower surface of carriage frame 45, engages car 238 formed at right angles to the upper end' of lever 239 (Figs. 5 and 9) pivoted at 240 on transverse frame member 20. The lower distended end of lever 239 is provided ape seo with a camming surface 241 for cooperation with roller 242 mounted on the laterally extended end of one arm 243 of a three-arm lever 244 pivotally mounted on shaft 211. ,The second arm 245 of three-arm lever 244 carries pin 246 normally maintained out of engagement with one arm 247 of bail 248 rockably, mounted on shaft-214, the other arm 249 of bail 248 being effective, upon counter-clockwise rotation of bail 248'(as viewed from the right as in Fig. 9), to effect a disengagement of the left shift clutch 137 in' the full-cycle position thereof. Similarly, as in the occurrence of 'the' engagement of the clutch 136, as arm 197 (Fig. 5) is rocked to effect engagement of the left shift ,clutch 137, bail 248 is rocked clockwise (Fig. 9) sufficiently to engage arm 247 with pin 246. Y

"As the carriage is, moved into its leftmost position, lever 239 is rocked (clockwise in Fig. 5) to impart a clockwise rotation to'lever. 244 (Fig; 9) which is immediately effective, through pin 24.6, to rock bail 248 counter-clockwise, thereby effecting a disengagement of the clutch 137. Means are provided to disable the left shift.

control mechanism simultaneously withfthe disengagement of the left shift'clut'ch 137. For thispurpose link 250 (Figs. 4 and 9) is pivoted at its rearward end at 251 on the lower end'of the arm 252 of three-arm lever 244, and at its forward end is pivoted at253 on one arm 254 of a bail 255 rockably mounted on, transverse shaft 256 journalled at its ends in side frame members 10 and 12. The other arm 257 of bail 255 is provided with an elongated slot engaged by pin 260 on one arm 261 of bail 262 rockably mounted on shaft 256 (Figs. 4, 6 and 7). Arm 261 of bail 262 is provided with laterally extended ear 263 underlying the depending rearwardly'extended finger 264 of pusher arm 174. Thus, itican be seen that as lever 244 is rocked clockwise (Fig. 9) against the urgency of spring 265, link 250 is moved forwardly of the machine and rocks bails 255 and 262 counter-clockwise to lift pusher arm :174 out of operative relation with push rod 178, thereby releasing rod 178 to the urgency of its spring 17 9.. v

The foregoing description is believed to be sufficient for an understanding of the right and'left shift control mechanisms; However, for a more complete disclosure thereof, reference is to be had to the patent of Nathaniel F. Hawthorne, No. 2,852,192.

Zero resetting mechanism in respective frames 43 and 45 adjacent the upper ends of respective numeral wheel shafts 272 and 273. The upper and lower rack of each pair of: racks 270,271

cooperate in a well-known manner with respective mutilated gears 274, 275 to restore any of respective numeral wheels 42 or 44 to their 0 position, when displaced therefrom. To effect a zero resetting of either of the series of numeral wheels 42 or 44, respective rack bars 270, 271 are selectively moved to the right, as viewed from the front of the machine, by manually operated means (not shown) or by selectively operated power means. Since the present inventionis concerned more particularly with the power operation of rack bars 270, only that part of the zero resetting mechanism associated therewith will be described herein. A brief description, however, will be given of that part of the zero'resetting mechanism associated with numeral wheels 44' insofar as the selective control for either of the registers is conicerned.

The revolutions counter wheels37 may be simultaneously restored to 0 registration with the zero resetting of the registerdials 42. For this purpose, rack bars I reference is to be 'had provide for engagement'with shoulder 29.2 on

vmounted for rocking movement .verse' frame member crank 297 provided with rack 308 I reciprocation of. slide tory movement on a plurality of rollers 277 mounted cooperation with alternately 278 to effect a zero resetting'of No. 2,847,160. H v

The resetting operation of the ,nur'i1eral wheels in either register is etfec'ted'in anyshifted position of the carriage by similar 'zero resetting drive members which are normally inoperative with respect to]; theresetting mechanism in the carriage. Actuatingslide 282 (Figs. 1 and '10) is angular in form ilar supports 284 secured on carriage frame member 43 by any suitable'means, such as screws 285; At its right end, as viewed;fro'rrrtl1e nearer 'themachine, the horizontal fiangeof the angularly formed actuating slide 282 is extended to provide an operative control for rack bars 270 and 276 upon movement of the slide to the right. Actuator slide 282 is normally urged to the le'ft(Fig. by a spring means (not shown) whereby, in each ordinal position of the register carriage, a tooth of the plurality of ordinally spaced teeth 286 provided in the vertical flange of angularly formed actuator slide 282 is positioned. for engagement by ear 287 formed at right angles to slide 288mounted for endwise reciprocating movement by means of slot 289-in engagement with pin 290 on upwardly extended portion 291 of transverse frame member 19. It will be noted that car 237, in its inactive position shown in Fig. 10, is below teeth 286 to unimpeded shifting of the carriage. The normally inactive position of car 287 is determinedby the-position of'pin 290 in the agnularly upwardly ex- I complete description of the accumulat'or and revolutions counter 'reset'ting mechanism to the patent of Hawthorne et al.,

and is mounted for reciprocatcry movement by the engagement of each of similar slots adjacent the ends thereof with a pin 283 on simtended; right-hand end of slot 289. As viewed in Fig. 10,,withjthe, carriage in its leftmost position, it canbe seen that immediately upon reciprocation'of the slide 288, pin 290' will serve to cam ear 287 upwardly into actuator slide 282 to move the slidetoathe right.

,To effect a reciprocating movement of ear 287, slide .288 is pivotally connected at 295 "(F ig. 10) to the horinontally extended end of one 296 of bellcrank 297 onwpin 298 on trans- 19; The other arm 299 of hellextends laterally beyond right side frame .IO-and pivotallysupports, the upper end of link 300 which is normally urged upwardly by spring 301 secured at its oneend-on a pin on side frame member 10 and at its ot-h er' ,end' on'pin 302,011. the lower end of link 300. Spring301. serves, therefore, to urge: slide 288 to the inactiveposition shown in Fig. 10 r The zero resetting mechanism for controllingt'he zero resetting operation of numeral wheel dials 44 is similar to that mechanism associated with register dials 42. Actuator slide 306 (Figs. 1 and 10) is mounted at each end for" reciprocating movement on carriage frame member 45 by any suitable means, such as screws 307, and is having a plurality of ordinally spaced teeth 309 similar to teeth 286 on slide 282, one tooth for each ordinal position of the carriage 25. Teeth 309 are positioned for engagement by lateral actuating extension 310 onslide 311 (Fig. 1) structurally similar to slide 288- andmounted for endwise movement adjacent to, and parallel with, slide 288 on pin 290. Lateral extension 310 is normally positioned below teeth 309 to enable uninterrupted shifting movement of the carriage 25. Pin 290 serves, upon reciprocation of. slide 311 in cooperation with a slot similar to the slot 289 in slide ment with a corresponding tooth 309. To control the I 311, a bellcrank having the same configuration as that of bellcrank 297 is rockably mountvlink 300 downwardly to translate slide an pin in in 151m adiacent m and parallel with 'bellcr'ank 297; with the outwardlyextended arm of the "summit pivotally' supporting the upper end of link 312. Spring 313 teneioned between I pin 314 on the I lower end of link 312 and a stud on, side frame member 10; serves to normally maintain slide 311 and the lateral l extension 310 in the inactive position shown 'in Fig. 10. The operation of' th'e actuator slides 282 or 306 is selectively controlled by the downward movement of one or the other of the respective links 300 or 312. 1 The Y I reciprocatorymove'ment of the link 300 or 312 is condepending bracket .321 secured to transverse frame mem ber 19 (Fig. 10). Similarly, the lower offset end of the link 312 is provided with a-not'c'h opposed to,and aligned with, thenotch'in respectivelinks 3'00 and 312 are normally spring-urged to the upper end of respective vertical slots 322, 323

in the expanded arm 3240f bellcrank 325 pivoted at 326 on a bracket secured o'nside frame member '10. The I other arm 327 of bellcran'k 325 is pivotally connected to the manually operated member 328 and also carries one end of spring .329, the other end of which is secured to a stud in auxiliary frame member 64. Spring 329- serves to normally maintain the notch in link 300 in engagement with roller318 o'n arm31'9. However, if a zero resetting operation of numeral wheel dials 44 is desired, links 300 and 312 are rocked counter-clockwise (FigflO) upon manually controlled rocking of bellcran'k .325 to effect a disengagement and engagement of the respective notches with roller 318. With roller 318 normally engaged in the notchxo'fmlink 300 or selectively engaged by the notch in link 312, clockwise rocking of arm 319 becomes eifective to restore respective numeral wheels 42 or 44 to 0 registration as" disclosed in Patent No. 2,847,160.

Revolutions counter Wheels 37 (Fig. 1) will, whendesired, be reset to.0 simultaneously with the zero reresetting of the numeral wheeldia'ls =42;

To control the clockwise rocking movement of the am 319, a projection intermediate the ends thereof carries roller 332 urged! by spring 333 to follow cam 334 integrally mounted with gear 335 rotatable on stud 336 on transverse frame memberf19." Gear 335 is enmeshed with gear 337, the hub of which is secured on the forward end of shaft 338 (Fig. 11) and serves as a journal for gear 337 in transverse frame member 19. At its rearward end shaft 338 is journalled in transverse frame member 20 supported in the frame-Work of the machine.

With each rotation of gears 3.37 and 335, cam 334 efiects an oscillatory movement of arm 319 which, with the roller 318 normally positioned as shown in Fig. 10, moves 288 and car 287 to the right, causing actuation of zero resetting slide 282.

I rearwardly and carries P601131 339 288, to cam extension 310 into active position for engage- Selectively operable drive means are trol the cyclic rotation of cam 334 and the lowest order actuating" shaft 71 provided to confor this purpose (Fig; 11) is extended end thereof. Collar- 339 is provided with diametrically opposed slots engageab'le by, corresponding teeth 340 on the forward end of a shiftable drive establishing collar 341 slida-bly mounted on the end opposite end thereof collar 341 tooth 342 tootli=343 on the hub of mentof tooth 342 with tooth 343 on the hub of gear 337', shaft 344 journa'll'ed at its ends in side frame members I0 and 11 (Figs. 10*, 11 and 12), carries similar upright time 345' and 345. The free end ofarm 345"is slottedto r upon rockin is provided with arcual trol" the slidihg niovemeut of collar 341 on shaft 71. Os-

link 300 for selective engagement with Q roller 318 on arm 319. Each or. pins 302 and 314 on secured adjacent the g of shaft 71. On the adapted for engagement with the corresponding gear 337. To control the engageage annular flaiige 347 ofcollar 341 so that i v g of shaft 344, arm 345] is operative to con- 11' cillation of the arm 345 is controlled by the movement of the push rod 349 and disk 348 secured thereon and engaged in the bifurcated free end of arm 346 secured on shaft 344 adjacent leftside frame member 11. Push rod .349 is mounted for endwise movement in transverse frame .members 16 and 18 and is normally urged forwardly of r the machine or to the left (Fig. 8) by spring 350.

on shaft 360 and carries one end of link 316, the other end of which is pivotally mounted on pin 357 of arm 358. Thus, upon clockwise. rocking movement of shaft 360, pusher link 355 move s push rod 349 rearwardly to effect engagement of the resetting clutch.

The operation of the zero resetting mechanism associated with either of numeral wheel dials 42 or 44 may be rendered operable by the depression of a selected one of two controlkeys (not shown), either of which is effective to impart a clockwise rockingmovement to shaft 360 (Fig. 8) and to engage the clutch and close the motor switch in a conventional manner, as fully described in the aforementioned Patent No. 2,847,160. Shaft 360 may also be rocked clockwise, as viewed'in Fig. 8, by the depression of the dividend tabulating key 154 (Figs. 3

and 4), as will be hereinafter described.

In 180 of the zero resetting cycle, pusher arm 355 (Figs. 4 and 8) is disengaged from push rod 349 thereby enabling spring 350 to restore rod 349 to its inactive position. For this purpose cam 362 is secured on shaft 363 journalled at its one end in a bracket 364 secured on transverse frame member 16, and at its other end shaft 363 is journalled in leftside frame 12 and is cyclically driven by bevel gearing 365 from angularly disposed shaft 366 having a bevel gear connection 367 with-main drive shaft 69. Cam 362 is operatively related to pin 368 on a depending portion of pusher arm 355, such that upon movement of arm 355 to the right and following 180 of the first machine cycle, cam 362engages pin 368 to raise the notched end of pusher arm 355 out of engagement with the forward end of push rod 349 and maintains pusher arm 355 in the disengaged position for a substantialv portion of the remainder of the cycle. However, teeth 342 and 343 of the resetting clutch are frictionally maintained in engagement until near the end of the cycle due to the load imposed thereon. The structural shape of the cam (Fig. is such that immediately prior to the end of the cycle, arm 319 and therefore roller 332 become effective, under the urgency of therelatively strong spring 333, to rotate cam 334 and therefore tooth 343 ahead of the driving tooth 342, thereby releasingthe frictional bond therebetween so that collar,

341 is immediately restored to its normally inactive position under the influence of spring 350 on pusher rod 349 substantially simultaneously with the return of the pusher arm 355 under control of cam 362. I

T dbulation and dividend entry The tabulating and dividend entry mechanism of the instant invention operates to zeroize revolutions counter dials 37 and register numeral wheels 42 as a preliminary to a division operation, to effect a shifting movement of the accumulator carriage in either direction to a selected ordinal position, and to efiect entry of the dividend into the accumulator in the selected ordinal position thereof while suppressing the usual count made in the revolu tions counter during entry of the value into the accumulator. After setting the dividend into the keyboard, the only other operation necessary is the depression of the dividend control key after which the machine automatically operates. to perform the above-described functions. The desired ordinal position of the carriage in which the dividend entry is to be effected is preset in accordance with the number of quotient figures desired or to indicate the position of the decimal point in the quotient.

In the embodiment of the invention selected for illustration, the first operation which occurs on depression of the dividend key 154 (Figs. 3 and 9) is an operation of the zero resetting. means immediately followed by a shifting of the carriage in one direction or the other as determined by the dividend tabulating button which has been preset, if the carriage is displaced from the desired tabulated position.

Referring to Figs. 3 and 9 dividend key 154 is mounted .for endwise sliding movement on the side frame 10 by means of pin 372 engaging a slot therein. Spring 373 urges key 154 to the raised position shown in Fig. 3. An elongated slot 374 is provided in key 154 adjacent the lower end thereof to receive a pin 375 carried at the endof one arm of a bellcrank 376 pivotally mounted at 377 on side frame 10.

Intermediate its ends key 154 (Figs. 3 and 9) is provided with a latching notch 378 for engagement by the latching endof a latch slide 379 mounted for endwise sliding movement on the side frame member 10 (shown partially in phantom line in Fig. 9) by similar pin-andslot connections 380 and normally urged forwardly to its latching position by a spring 381. Thus, upon depression of key 154, slide 379 becomes effective to latch the key in depressed position and it remains latched until near the end of the operationv when it is released by means to be described later.

Depression of key 154 serves to enable operation of the zero resetting mechanism for the revolutions counter dials 37 and the register dials 42, to condition power means for the control of the right or left shift mechanism, to block the counter actuator, and to effect engagement' of themain drive clutch 68 and the closing of the motor switch.

. The zero resetting mechanism and the drive means are enabled, upon depression of key 154 (Fig. 3), when the key operates to impact a counter-clockwise rotation to bellcrank 376, the depending arm of which carries the pin 382 in engagement with the inclined surface 383 of an arm 384 secured on shaft 360 journalled in the frame- ,work of the machine. Therefore, counter-clockwise rocking movement of bellcrank 376 imparts a counter-clock.

wise rocking movement to arm 384 and shaft 360. Referring to Figs. 3, 4 and 8, shaft 360 serves to rock arm 359, in a clockwise direction as viewed in Fig. 8, to move pusher arm 355 and push rod 349 rearwardly of the machine, thereby engaging tooth 342 with tooth 343 of the zero resetting clutch (Fig. 11). Rearward movement of pusher arm 355 also positions pin 368 thereon into operative relation with cam 362 on shaft 363.

To engage the clutch and close the motor switch, shaft 360 carries an arm 385 (Figs. 3 and 4), which arm is provided with a roller 386 engaging one arm or" a lever 387 rockably mounted on shaft 256. The other arm of lever 387 is formed upwardly for engagement with the pin which pivotally connects lever 78 with motor switch link 80 in a manner such that, upon counterclockwise rocking of shaft 360 (Fig. 3), arm 385 rocks lever 387 clockwise to engage the main driving clutch and to close the motor switch substantially simultaneously with the engagement of the zero resetting clutch.

Shaft 360 also carries bellcrank 399 intermediate the ends thereof, asseen in Figs. 4 and 13, to condition conventional power-driven mechanism for the selective control of the right or left carriage shifting mechanism. Pin 391 on one arm of bellcrank 390 is engaged in slot .392 in one end of link 393, which is normally urged to a the right in Fig. 13 by spring 394. Link 393 is pivotally connected to arm 395 of hook member 396 rotatably mounted on eccentric 397 secured between twosimilar 13 disks 398 pinned on shaft 363. Arm 399 of hook member 396 is provided with a hook 400 for cooperation with pin 401 on one arm 402 of bellcrank 403 secured on shaft 256 in a plane adjacent the hook member 396.

As explained hereinbefore, shaft 363 is cyclically' driven' from the main drive shaft 69 through bevel gearing 365 and 367. It is thus obvious that the hook member 396 continuously rocks on its eccentric mounting in synchronism with the main drive shaft whenever the driving clutch 68 is engaged and the'motor switch is closed.

With the clockwise rocking of shaft 360 (Fig. 13)

, and bellcrank 390, the leading edge of the hook end of arm 399 is rocked into abutting relation with pin 401 and tensions spring 394. In the initial cycle of rotation of shaft 363, i.e., the first machine cycle, the eccentrically controlled movement of hook member 396 moves the hook 400 to a position above pin 401 for engagement therewith under the urgency of the tensioned spring 394. Upon further rotation of shaft 363 and near the end .Of the initial cycle of the machine operation, eccentric 397 serves to rock bellcrank 403 in a clockwise direction,

whereupon pin 404 thereon is engaged by shoulder 405' of latch arm 406 under the urgency of spring 407. Following the engagement of the latch arm 406 with pin 404 the rocking of the eccentrically operated member 396 is inelfectivewith respect to bellcrank- 403 and is thereafter disengaged therefrom. Bellcrank 403 remains in its latched position until release of the control key when spring 81 (Fig. 3) urges shaft 360 and bellcrank 390 counter-clockwise (Fig. 13); Pin 408" on bellcrank 390 is then effective to release latch 406, thereby permitting restoration of bellcrank 403 to its counter-clockwise rocked position under the urgency of spring 409.

Normally, bellcrank 403 and shaft 256, when rocked by eccentrically operated hook member 396, function to effect engagement of the left shift clutch 137 (Fig. 5) or to selectively control engagement of right shift clutch 136. To effect engagement of the clutch 137, shaft 256 carries an arm 414 (Figs. 4 and 7) on which the pusher arm 415 is pivotally connected at 416. The pusher arm 415 has its rearwardly extended end 417 notched for normal engagement with pin 183 on arm 181, the arm 181 being integral with sleeve 182 and hence with the arm 180 carrying pin 177 abutting the end of left shift push rod 178. For control of the engagement of the right shift clutch 136, shaft 256 also carries an arm 419 (Figs. 4 and 6) on which a lever 420 is pivoted at 421. A notch is provided in the rearward end 422 of right shift control lever 420 for selective engagement with pin 172 on arm 171 in accordance with the shifting movement required to move the carriage directly to the desired tabulated position thereof. The notch in the rearward end of lever 420 is normally maintained out of engagement with pin 172 under the influence of a spring 423 secured at its one end on a pin on a downwardly and forwardly extending arm 424 of lever 420, and at its other end on a pin on inverted L-shaped arm 425 secured on a shaft 426 journalled at its ends in side frame members and 12.

It will be recalled that clockwise rocking of shaft 256 (Fig. 7) moves the normally engaged pusher arm 415 rearwardly to impart a counter-clockwise rotation of integral arms 180, 181 which effects a rearward movement of push rod 178 to engage the left shift clutch 137. Therefore, if a right carriage shifting operation is required to move the carriage to a preset tabulated position, shaft 426 (Figs. 6 and 7) is first rocked in a clockwise direction to remove the notched end of pusher arm 415 from its normal engagement with pin 183 on arm 1,81and to effect an engagement of the notched end of lever 420 with the associated pin 172 on arm 171. In that event, the depression of dividend tabulating key 154, andconsequent clockwise rocking of shaft 256, moves lever 420 and therefore push rod 167 rearwardly to effect an engagement of the right shift clutch 136.

the keyboard of the machine.

To determine the direction or the shifting rmament; of the carriage25, a series of conventional tabulatorkeys, or buttons, 430is provided ,in the carriage, the keys being numberedl to 10"i'n' accordance with the positions to which the carriage may be shifted relative td In the first, or leftmost, position" of the carriage, as seen in Fig. 4, the rightmost revolutions counter wheel 37 and register'wheels 42 and 44 are aligned with the rightmost, or units order, keys in the keyboard. In any shifted position of the carriage to the right offthatshown in Fig. 4, the tabulator buttons, or keys, 430-to the left of the position occupied by the 1 key in Fig. 4 will be considered to be inboard of the machine, while those keys 430 to the right of the tabulating operation, the depression of another of the' keys 430 to control a subsequent operation releases the latched key and latch slide 434 becomes effective to latch the subsequently depressed key in depressed position.

Latching slide 434 is maintained in position in the frame.

bar 431 by retaining bracket 436. Each of tabulator keys 430 is urged to its normally'inactive position by spring 437 upon release of latch slide 434. Regardless of the position of the carriage 25, the position of a depressed key 430 to the right or the left of the units or der, or home position of the carriage, i.e., the position occupied by the "1 key 430 inFig. 4, determines the direction of shifting movement of the carriage upon depression of the dividend tabulating key 154. If the depressed key 430 is to the left of the position of the I key in Fig. 4, the carriage will be shifted to the right to the desired tabulated position. Conversely, if the depressed tabulator key is to the right of the positionlof the 1" key the carriage will be shifted to the left to the desired position. With the carriage positioned as shown in Fig. 4, a depression and latching of the 2 tabulator key 430 inboard of the machine serves to corn dition mechanism for operation by a subsequent depression of the dividend tabulating key 154 to render the left shift pusher arm 415 (Fig. 7) ineffective to control a left shift operation and to rock the notch in the end of lever 420 into engagement with pin 172 on arm 171 to enable engagement of the right shift clutch 136. A lever 442 (Figs. 15, 16, and 17) is pivoted at 443 on the front surface of transverse frame member 22 for clockwise rocking movement (Fig. 15) in a plane paral lel to bar 22 and has its rightmost end overlying the laterally extended upper end 444 of a right shift control slide 445 (Fig. 9) mounted for endwise movement by slots in either end thereofengaging pins 446 on side frame member 10 shown in phantom line. At its leftmost end, as viewed in Figs. 15 and 16, lever 442 is provided with an ear 447 formed inwardly to abut the face of transverse bar 22 and to overlie the upwardly extended end of a horizontally disposed arm of a lever 448 pivoted at 449 on a bracket 450 secured to, and extendflange, of an angular member 454 adjacent the end thereof. Adjacentits other end, the vertically disposed leg of angular member 454is pivotally connected at 455 to one end of an arm- 456 which is rockably mounted at its other end on a pin 457 on bracket 450. The length of the arm 456 is equal to that of arm 452 of lever 448 and each. is similarly angularly disposed to pro vide for parallel. horizontal movement downwardly of angle 454. The horizontal leg 458 of angle bar 454 is of sufiicient width and length for engagement by the lower end of. any one of the 2 to 10 tabulator keys 430 upon depression thereof when. the carriage 25 is in its leftmost position.

With the carriage 25 in its leftmost position, as viewed in Fig. 4, and with the 1" tabulator key 43%) depressed, as seen in Fig. 14, the angle bar 454 is maintained in the inactive position shown in Figs. 14 and 17 by a spring 459 secured at its one end on a screw stud 451 and at its other end on a stud on lever 442. The movement of the angle bar 454 upwardly, under the influence of spring 459, is limited by the engagement of a laterally disposed ear 460 on the vertical leg of the bar 454 with the lower surface of the transverse frame member 22. The angle member 454 would also remain in its inactive position if the carriage 25 were positioned to the right of the position shown in Fig. 4 and if the depressed tabulator key 430 is not cooperatively positioned relative to the bar 454.

As stated hereinbefore, with the carriage positioned as shown in Fig. 4, a depression and latching of the 2 tabulator key, the second key from the left in Fig. 14. immediately imparts a downward movement to angle member 454 which, through lever 448 rocks lever 442 (clockwise in Fig. 14). The rocking of lever 442 moves slide 445 downwardly (Fig. 9) to condition mechanism for control by the dividend tabulating key 154, upon depression thereof, to disable the left shift control mechanism and to condition the right shift control mechanism in the first cycle of machine operation. Slide 445 (Figs. 9 and 18) carries a pin 465 engaged in a slot 466 extending longitudinally intermediate the ends of an arm 467 pivoted at 468 on rightside frame member 10. The free end of arm 467 overlies a pin 469 (Fig. 19), aligned with pin 607 of Fig. 18, on one arm 470 of a three-arm lever 471 pivoted at 472 on an arm 473 secured on shaft 426. The upper end of the center arm 474 of three-arm lever 471 extends laterally and in the top surface thereof is provided with a V-shaped notch 475. Thus, it can be seen that upon downward movement of of shaft 426 (Figs. 7 and 18), bellcrank 486 is rocked counter-clockwise to. raise pusher arm- 415 out of left shift controllingposition. I

Since the. depression of any tabulator key 430 positioned inboard of the machine causes the carriage to be shifted to the right to the desired tabulated position, normally disengaged right shift control lever 42%" (Fig. 6) must be rocked clockwise to engage the notched reara ward end thereof with pin 172 on arm 171. A spring slide 445, arm 467 is rocked (counter-clockwise in Figs.

9 and 18) toirnpart a clockwise rotation to three-arm lever 471 against the urgency of a relatively lightspring 476 secured at its one end on a stud on arm 474 and at its other end on a pin 477 on a projection of arm 473, thereby moving the right side of V-notch 475 into position for engagement by a pin 478 on the lower end of dividend tabulating key 154. If there is no tabulator key 430 depressed inboard of the machine, spring 476 serves to urge the forward edge of the lateral extension of arm 471 into engagement with pin 477 to maintain slide 445 and therefore angle member 454 in their inactive position. However, with the 2 tabulator key 4343 depressed and latched, lever 471 will be maintained in its clockwise rocked position, the extent of rocking movement being determined by the engagement of a third arm 479 of lever 471 withpin 477 on arm 473. Upon depression of divided tabulating key 154, pin 4-78 contacts the right side of the V-notch 475, and through lever 471, imparts a clockwise rotation to arm 473 and therefore shaft 426, as viewed in Figs. 9 and 18.

To rock left shift pusher arm 415 counter-clockwise (Fig. 7) so that the notch in the rearward end thereof isamoved out of engagement with pin 183 on arm 181, an arm 484 secured on shaft 426 carries a .pin 485 in engagement withthe lower end of a depending arm of a hel1crank-486 pivotally mounted on shaft 256. The

other arm of bellcrank 486 underlies a pin 487 on pusher arm 415, so that, upon clockwise rocking movement 488 is secured at its one end on a pin on arm 425 secured on shaft 426 and at its other end on a pin on an arm 489 rockably mounted on shaft 426 and normally serves to resiliently retain arm 489 in engagement with a pin 490 on arm 425. At its free end arm 489 carries a pin 491 underlying the forwardly extended end of arm 424 of lever 420 which is maintained in engagement with pin 49]. by the influence of spring 423. A spring 492 secured at its one end in the framework of the machine and at its other end on a pin on arm 425, serves to maintain arm 425, shaft 426, and arm 473 in their normally inactive counter-clockwise position as determined by the engagementof the downwardly extended end of arm 489 with transverse shaft 361). It is obvious, therefore, that upon clockwise rocking movement of shaft 426 and arm 425 (Fig. 6), arm 489 is likewise rocked under the influence of spring 488 to rock'the notched end of control lever 420 into engagement with pin 172 on arm 171. The disengagement of the normally engaged left shift pusher arm 415 with its pin 183 and the engagement of the normally disengaged right shift control arm 420 with its pin 172 is effected by the depression of the dividend tabulating key 154 simultaneously with the clockwise rocking of shaft 360 to engage the zero resetting mechanism (Fig. 8) and the main clutch 68 and to close the motor switch.

It will be recalled that the clockwise rocking of shaft 360 (Fig. 13) conditions the eccentrically operated hook member 396 for engagement with pin 401 in the first machine cycle, but that shortly prior thereto, at about the point of the first cycle, cam 362 (Fig. 8) operates through pin 368 to disengage zero resetting pusher arm 355 from engagement with push rod 349 to enable disengagement of the zero resetting clutch 342, 343 (Fig. 11). In the latter part of the first cycle, the rotation of shaft 363 (Fig. 13) operates the hook member 396 to rock shaft 256 clockwise, thereby enabling control lever 4'20 (Fig. 6) to engage the right shift clutch 136 for operation in the ensuing cycle or cycles.

If the carriage 25 is positioned to the right of the position shown in Fig. 4 and any one of the outboard tabulator keys 430 is depressed, a depression of the dividend tabulating key 154 will immediately initiate a zero resetting operation in the first machine cycle and effect a left carriage shift operation in the subsequent cycle or cycles. It will be remembered that the notch in the left shift pusher arm 415 is normally engaged with pin 183 on arm 181 to control a left carriage shift operation, while the notch in the rearward end of the right shift control arm 420 is normally out of engagement with pin 172 on arm 171 and, since the depressed tabulator key 430 is outboard of the machine, slide 445 and angle member 454 remain in the inactive position shown in Figs. 9 and 14. Therefore, the depression of the dividend tabulating key 154 initiates operation of the zero resetting mechanism, engages the main drive clutch and closes the'motor switch, and enables the operation of the eccentrically controlled hook member 396 in the first machine cycle to effect a left carriage shift operation in the subsequentcycle or cycles.

'Referring'to Fig. 4, if the 2 tabulator key 430 is depressed, the subsequent depression of the dividend tabulating key 154 (Fig. 9) effects operation of the zero resetting mechanism and operation of the right carriage shifting mechanism to move the carriage one ordinal 17 position to the right from the position shown in Fig. 4, whereupon the depressed key 430 becomes effective to terminate the operation of the shifting mechanism, to block actuation of the revolutions counter actuator, and

to adjust the plus-minus spools 46 for an additive operav tion, thereby enabling the entry of the dividend into the numeral wheel dials 42. Pin 478 on the lower end of dividend tabulating key 154 (Figs. 9 and 18) is engaged in an elongated slot 496 in the horizontally extended portion of a T-shaped arm 497 pivoted at 498 on right side frame member 10. A lever 499 is pivotally mounted at its f orward end at 500 on the vertical arm of T-shaped member 497 and at its rearward end is provided with an elongated slot 501 engaging a roller 502 on the end of an arm of three-arm lever 503 pivoted on a shaft 513 journalled in frame members 10 and 13. The top edge of lever 499 is provided with a camming surface 504 for cooperation with a pin 505 on the lower end of a dividend entry control slide 506 mounted for endwise sliding movement on pins 446.. Slide 506 is shown in its operated position in Figs. 9 and 18, but is normally urged to its raised position by a spring 507 when carriage 25 and depressed tabulator key 430 is to the right or the left of the desired tabulated position.

The rearwardly offset end of a lateral extension 508 formed at right angles to the upper end of slide 506, underlies the free end of a lever 509 pivoted at 510 for rocking movement on bracket 450 (Fig. 14). Adjacent the free end thereof, lever 509 is provided with an ear 511 projecting upwardly and formed-over at its extremity, to provide a camming shoe 512 for sliding contact with the lower end of a depressed tabulator key 430 as the carriage is moved into the desired tabulated position. As key 154 (Figs 9 and 19) is depressed to initiate a dividend tabulating operation, T-shaped member 497 is rocked counter-clockwise to move lever 499 rearwardly, positioning the top edge of the lever, to the left of the camming surface 504, beneath pin 505 on slide 506. As the 2 tabulator key 430 is moved to the first ordinal position (to the left in Fig. 14 or to the right in Fig. 4), the lower end of the depressed key 430 is moved onto the top of shoe 512 thereby camming lever 509 counterclockwise to move slide 506 downwardly (Fig. 9) against the urgency of spring 507. Thereupon pin 505 engages the top surface of lever 499 to rock the lever clockwise, thereby imparting a counter-clockwise movement to three-arm lever 503. Counter-clockwise movement of lever 503 serves to condition mechanism which, in the last part of the shift cycle, becomes effective to terminate the shifting operation, to block the counter-actuator, and to adjust the plus-minus spools 46 to effect an entry of the dividend. Levers 499 and 503 are normally urged to the inactive position shown in Fig. 9 by a spring 516 secured at its one end to a pin on side frame member 10 and at its other end in an aperture in an arm 517 of lever 503, whereby ann 517 engages a stop pin 518 on side frame member 10. At its end, arm 517 carries a roller 519 underlying an arm 520 pivoted at 521 on the depending end of an arm 522 secured on a shaft 523 journalled in side frame members 10 and 13 and auxiliary frame member 64. A third arm 524 of three-arm lever 503 carries a pin thereon, the end of which serves to guide arm 520 against lateral displacement during its reciprocatory movement, as described hereinafter.

The timing sequence of the dividend entry phase of the operation is under the control of a cam 529 (Fig. 2) secured on the end of the driving shaft 138 for the right and left shift clutches 136 and 137 (Fig. In the fullcycle position of the parts, as shown in Fig. 2 and in phantom line in Fig. 9, a roller 525 on an arm 526 of a bellcrank 527 pivoted at 528 on auxiliary frame member 64 is in engagement with the periphery of the larger arcuate portion of cam 529. A depending arm 530 of bellcrank 527 carries a pin 531 engaging in an elongated slot 532 in the upper end of an arm 533 secured on the outer end of shaft 523. Roller 525 is urged by a spring 534 to follow cam 529 during its rotation.

In the first 140 of the shift cycle, the depressed tabulator key 430 is moved onto the shoe 512 of lever 509 (Fig. 14) and spring 534 (Fig. 2) urges bellcrank 527 clockwise to engage roller 525 with the smaller arcuate surface 538 of the earn 529 thereby moving arm 520, to the right as viewed in Fig. 9. With the downward movement of slide 506 by lever 509 and the counterclockwise rocking of lever 503, a notch 539 in the free end of arm 520 is moved into position for engagement with a pin 540 on a triangular plate member 541 pivoted at 542 on a projection of a distended arm 543 of a bellcrank 544 secured on the left end of shaft 513, shown also in Fig. 4. Pin 540 is normally held against the upper edge surface of arm 543 by a spring 545 secured at its one end on a stud on plate member 541 and at its lower end on a stud on an arm 546 of bellcrank 544. The contour of arm 546 is similar to that of the forwardly extended arm of bellcrank 503 and carries a pin 547 (Figs. 4 and 9) coaxial with pin 502 on bellcrank 503 and engaging in an elongated slot (similar to slot 501) in the rearward end of a lever 548 mounted for oscillatory movement on a pin 549 on side frame member 10. At its forward end lever 548 carries a pin 550 underlying an arm 551 of a bail 552 (Figs. 4, 9 and 18) and an adjacent arm 553 of a bail 554, both of which bails are rockably mounted on transverse shaft 426. A second arm 555 of bail 552 is pivotally connected to the lower end of a link 556 pivotally connected at its upper end at 253 on arm 254 of bail 255. The other arm 557 (Figs. 4 and 6) of bail 554 extends angularly upwardly and is provided at its end with a pin 558 which engages with the depending projection 559 of right shift control lever 420 when lever 420 is rocked clockwise to engage the notched end thereof with pin 172.

As previously explained, following the first 120 of the effective, or last shift, cycle required to move the carriage into its desired tabulated position, arm 520 (Fig. 9) is moved rearwardly to effectively position the shoulder of notch 539 therein to the right of the pin 540. In the next 20 of the cycle the lower end of the depressed tabulator key 430 is moved onto the shoe 512 to depress slide 506, thereby rocking arm 520 clockwise to position the notch 539 for engagement with pin 540. Arm 520 remains in this retracted position for the next i.e., 215 of the cycle, following which, cam 529 (Figs. 2 and 9) serves to rock bellcrank 527 counterclockwise and shaft 523 clockwise to move arm 520 to the left, guided in its reciprocatory movement between the end of the pin on arm 524 and arm 543 of bellcrank 544. As arm 520 is moved to the left, the shoulder of the notch 539 therein engages pin 540 to impart a counterclockwise rotation to bellcrank 544, thereby rocking lever 548 clockwise, which, through pin 550 in the forward end thereof, rocks bails 552 and 554 counter-clockwise (Figs. 9 and 18). In the example given supra, where the movement of the carriage is to the right, as viewed in Fig. 4, the counter-clockwise rocking movement of the bail 554 (Figs. 4 and 6) serves, through arm 557 and pin 558 thereon, to rock right shift control lever 420 counter-clockwise, thereby disengaging the notch in the rearward end thereof from the pin 172 to immediately effect a disengagement of the right shift clutch. Since the depression and latching of the dividend tabulating key 154 has rocked shaft 426 and therefore arm 425 clock- Wise (Fig. 6) to effect engagement of right shift control lever 420 with the pin 172, the counter-clockwise rocking movement of the lever 420 to terminate the right shift operation, rocks arm 489 counter-clockwise about shaft 426 against the tension of spring 488.

If a left shift operation was required to move the carriage into the desired tabulated position, the counterclockwise rocking of bail 552 (Fig. 18) would serve through link 556 (Figs. 4, 6, 9 and 18) to impart. a 

